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HTML 

              
                <!-- INSERT HTML HERE -->
<div class="container">
	<h2>Password Generator</h2>
	<div class="result-container">
		<span id="result"></span>
		<button class="btn" id="clipboard">
			<i class="far fa-clipboard"></i>
		</button>
	</div>
	<div class="settings">
		<div class="setting">
			<label>Password length</label>
			<input type="number" id="length" min='4' max='20' value='20' />
		</div>
		<div class="setting">
			<label>Include uppercase letters</label> 
			<input type="checkbox" id="uppercase" checked />
		</div>
		<div class="setting">
			<label>Include lowercase letters</label> 
			<input type="checkbox" id="lowercase" checked />
		</div>
		<div class="setting">
			<label>Include numbers</label> 
			<input type="checkbox" id="numbers" checked />
		</div>
		<div class="setting">
			<label>Include symbols</label> 
			<input type="checkbox" id="symbols" checked />
		</div>
	</div>
	<button class="btn btn-large" id="generate">
		Generate password
	</button>
</div>









<!-- SOCIAL PANEL HTML -->
<div class="social-panel-container">
	<div class="social-panel">
		<p>Created with <i class="fa fa-heart"></i> by
			<a target="_blank" href="https://florin-pop.com">Florin Pop</a></p>
		<button class="close-btn"><i class="fas fa-times"></i></button>
		<h4>Get in touch on</h4>
		<ul>
			<li>
				<a href="https://www.patreon.com/florinpop17" target="_blank">
					<i class="fab fa-discord"></i>
				</a>
			</li>
			<li>
				<a href="https://twitter.com/florinpop1705" target="_blank">
					<i class="fab fa-twitter"></i>
				</a>
			</li>
			<li>
				<a href="https://linkedin.com/in/florinpop17" target="_blank">
					<i class="fab fa-linkedin"></i>
				</a>
			</li>
			<li>
				<a href="https://facebook.com/florinpop17" target="_blank">
					<i class="fab fa-facebook"></i>
				</a>
			</li>
			<li>
				<a href="https://instagram.com/florinpop17" target="_blank">
					<i class="fab fa-instagram"></i>
				</a>
			</li>
		</ul>
	</div>
</div>
<button class="floating-btn">
	Get in Touch
</button>

<div class="floating-text">
	Part of <a href="https://florin-pop.com/blog/2019/09/100-days-100-projects" target="_blank">#100Days100Projects</a>
</div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Muli&display=swap');

* {
	box-sizing: border-box;
}

body {
	background-color: #3B3B98;
	color: #fff;
	display: flex;
	font-family: 'Muli', sans-serif;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	padding: 10px;
	min-height: 100vh;
}

p {
	margin: 5px 0;
}

h2 {
	margin: 10px 0 20px;
	text-align: center;
}

input[type=checkbox] {
	margin-right: 0;
}

.container {
	background-color: #23235B;
	box-shadow: 0px 2px 10px rgba(255, 255, 255, 0.2);
	padding: 20px;
	width: 350px;
	max-width: 100%;
}

.result-container {
	background-color: rgba(0, 0, 0, 0.4);
	display: flex;
	justify-content: flex-start;
	align-items: center;
	position: relative;
	font-size: 18px;
	letter-spacing: 1px;
	padding: 12px 10px;
	height: 50px;
	width: 100%;
}

.result-container #result {
  	word-wrap: break-word;
	max-width: calc(100% - 40px);
}

.result-container .btn {
	font-size: 20px;
	position: absolute;
	top: 5px;
	right: 5px;
	height: 40px;
	width: 40px;
}

.btn {
	border: none;
	color: #fff;
	cursor: pointer;
	font-size: 16px;
	padding: 8px 12px;
	background-color: #3B3B98;
}

.btn-large {
	display: block;
	width: 100%;
}

.setting {
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin: 15px 0;
}

@media screen and (max-width: 400px) {
	.result-container {
		font-size: 14px;
	}
}

/* SOCIAL PANEL CSS */
.social-panel-container {
	position: fixed;
	right: 0;
	bottom: 80px;
	transform: translateX(100%);
	transition: transform 0.4s ease-in-out;
}

.social-panel-container.visible {
	transform: translateX(-10px);
}

.social-panel {	
	background-color: #fff;
	border-radius: 16px;
	box-shadow: 0 16px 31px -17px rgba(0,31,97,0.6);
	border: 5px solid #001F61;
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	font-family: 'Muli';
	position: relative;
	height: 169px;	
	width: 370px;
	max-width: calc(100% - 10px);
}

.social-panel button.close-btn {
	border: 0;
	color: #97A5CE;
	cursor: pointer;
	font-size: 20px;
	position: absolute;
	top: 5px;
	right: 5px;
}

.social-panel button.close-btn:focus {
	outline: none;
}

.social-panel p {
	background-color: #001F61;
	border-radius: 0 0 10px 10px;
	color: #fff;
	font-size: 14px;
	line-height: 18px;
	padding: 2px 17px 6px;
	position: absolute;
	top: 0;
	left: 50%;
	margin: 0;
	transform: translateX(-50%);
	text-align: center;
	width: 235px;
}

.social-panel p i {
	margin: 0 5px;
}

.social-panel p a {
	color: #FF7500;
	text-decoration: none;
}

.social-panel h4 {
	margin: 20px 0;
	color: #97A5CE;	
	font-family: 'Muli';	
	font-size: 14px;	
	line-height: 18px;
	text-transform: uppercase;
}

.social-panel ul {
	display: flex;
	list-style-type: none;
	padding: 0;
	margin: 0;
}

.social-panel ul li {
	margin: 0 10px;
}

.social-panel ul li a {
	border: 1px solid #DCE1F2;
	border-radius: 50%;
	color: #001F61;
	font-size: 20px;
	display: flex;
	justify-content: center;
	align-items: center;
	height: 50px;
	width: 50px;
	text-decoration: none;
}

.social-panel ul li a:hover {
	border-color: #FF6A00;
	box-shadow: 0 9px 12px -9px #FF6A00;
}

.floating-btn {
	border-radius: 26.5px;
	background-color: #001F61;
	border: 1px solid #001F61;
	box-shadow: 0 16px 22px -17px #03153B;
	color: #fff;
	cursor: pointer;
	font-size: 16px;
	line-height: 20px;
	padding: 12px 20px;
	position: fixed;
	bottom: 20px;
	right: 20px;
	z-index: 999;
}

.floating-btn:hover {
	background-color: #ffffff;
	color: #001F61;
}

.floating-btn:focus {
	outline: none;
}

.floating-text {
	background-color: #001F61;
	border-radius: 10px 10px 0 0;
	color: #fff;
	font-family: 'Muli';
	padding: 7px 15px;
	position: fixed;
	bottom: 0;
	left: 50%;
	transform: translateX(-50%);
	text-align: center;
	z-index: 998;
}

.floating-text a {
	color: #FF7500;
	text-decoration: none;
}

@media screen and (max-width: 480px) {

	.social-panel-container.visible {
		transform: translateX(0px);
	}
	
	.floating-btn {
		right: 10px;
	}
}
!

JS 

              
                const resultEl = document.getElementById('result');
const lengthEl = document.getElementById('length');
const uppercaseEl = document.getElementById('uppercase');
const lowercaseEl = document.getElementById('lowercase');
const numbersEl = document.getElementById('numbers');
const symbolsEl = document.getElementById('symbols');
const generateEl = document.getElementById('generate');
const clipboard = document.getElementById('clipboard');

const randomFunc = {
	lower: getRandomLower,
	upper: getRandomUpper,
	number: getRandomNumber,
	symbol: getRandomSymbol
}

clipboard.addEventListener('click', () => {
	const textarea = document.createElement('textarea');
	const password = resultEl.innerText;
	
	if(!password) { return; }
	
	textarea.value = password;
	document.body.appendChild(textarea);
	textarea.select();
	document.execCommand('copy');
	textarea.remove();
	alert('Password copied to clipboard');
});

generate.addEventListener('click', () => {
	const length = +lengthEl.value;
	const hasLower = lowercaseEl.checked;
	const hasUpper = uppercaseEl.checked;
	const hasNumber = numbersEl.checked;
	const hasSymbol = symbolsEl.checked;
	
	resultEl.innerText = generatePassword(hasLower, hasUpper, hasNumber, hasSymbol, length);
});

function generatePassword(lower, upper, number, symbol, length) {
	let generatedPassword = '';
	const typesCount = lower + upper + number + symbol;
	const typesArr = [{lower}, {upper}, {number}, {symbol}].filter(item => Object.values(item)[0]);
	
	// Doesn't have a selected type
	if(typesCount === 0) {
		return '';
	}
	
	// create a loop
	for(let i=0; i<length; i+=typesCount) {
		typesArr.forEach(type => {
			const funcName = Object.keys(type)[0];
			generatedPassword += randomFunc[funcName]();
		});
	}
	
	const finalPassword = generatedPassword.slice(0, length);
	
	return finalPassword;
}

function getRandomLower() {
	return String.fromCharCode(Math.floor(Math.random() * 26) + 97);
}

function getRandomUpper() {
	return String.fromCharCode(Math.floor(Math.random() * 26) + 65);
}

function getRandomNumber() {
	return +String.fromCharCode(Math.floor(Math.random() * 10) + 48);
}

function getRandomSymbol() {
	const symbols = '!@#$%^&*(){}[]=<>/,.'
	return symbols[Math.floor(Math.random() * symbols.length)];
}







// SOCIAL PANEL JS
const floating_btn = document.querySelector('.floating-btn');
const close_btn = document.querySelector('.close-btn');
const social_panel_container = document.querySelector('.social-panel-container');

floating_btn.addEventListener('click', () => {
	social_panel_container.classList.toggle('visible')
});

close_btn.addEventListener('click', () => {
	social_panel_container.classList.remove('visible')
});
!
999px

Console